[Bug 51201] Removing one sudo user removes the sudo privilege of another sudo user

[chombee]

Public bug reported:

To reproduce:

1. Install ubuntu, create user1 as the default sudo user.

2. From user1, create user2, another sudo user (admin user profile).

3. From user2 delete user1.

Problem: Now user2 is no longer an admin user, and the system is left
with no sudoers.

I had to boot into recovery mode and do `adduser user2 admin` as I was
left with no sudo user.

This may have been my fault. When I removed user1, I first ran `sudo rm
-R /home/user1/` to save space, and only removed the user from
`Systems->Administration->Users and Groups` afterwards. Maybe this is
what caused the problem.

** Affects: gnome-system-tools (Ubuntu)
     Importance: Untriaged
     Assignee: Ubuntu Desktop Bugs
         Status: Rejected

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Removing one sudo user removes the sudo privilege of another sudo user
https://launchpad.net/bugs/51201